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Home >> BMW >> 2009 >> 135i 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (Engine - Repair (N52K)) >> Variable Valve Gear >> 11 37 010 Removing And Installing/Replacing Intermediate Levers (N52K) >> Version 1

Version 1

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Size (1) 55.2 mm 

Fig 1: Identifying Guide Block Dimension
G06900894Courtesy of BMW OF NORTH AMERICA, INC.

Necessary preliminary tasks: 

If necessary, move eccentric shaft (1) on twin surface to minimum lift (2).

Fig 2: Pretensioning Eccentric Shaft Upwards
G04751039Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Oil spray nozzle must be removed from 3rd cylinder (make a note of installation position of oil spray nozzle).

Secure special tool 11 4 270  with gripping pliers (3) to guide block (2).

IMPORTANT: Special tool 11 4 270  is only secured to guide block (2).
Adjusting the gripping pliers (3) on special tool 11 4 270  is not permitted. Risk of damage! 
Fig 3: Identifying Gripping Pliers And Guide Block With Special Tool (11 4 270)
G04751230Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Risk of injury in event of incorrect use.
IMPORTANT: Improper handling. Risk of damage! 

Secure both bearing pins (2) in torsion springs with knurled screw (1) of special tool 11 4 270. 

Press special tool 11 4 270  in direction of arrow as far as it will go.

Fig 4: Identifying Bearing Pins And Knurled Screw With Special Tool (11 4 270)
G04751231Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (2) of torsion spring.

Tightening torque. See 11 37 2AZ in 11 37 VARIABLE VALVE GEAR .

To avoid jamming of screw (2) with torsion spring, it is necessary when releasing screw (2) to relieve the pretension on special tool 11 4 270  uniformly.

IMPORTANT: Thread on cylinder head. Risk of damage! 
Fig 5: Identifying Torsion Spring Screw With Special Tool (11 4 270)
G04751232Courtesy of BMW OF NORTH AMERICA, INC.

Relieve tension on torsion spring (1) with special tool 11 4 270. 

NOTE: Metal lug (2) cannot be disassembled and must not be removed.

Installation: 

Replace torsion spring (1) if metal lug (2) is faulty.

Fig 6: Identifying Torsion Spring And Lug With Special Tool (11 4 270)
G04751233Courtesy of BMW OF NORTH AMERICA, INC.

Press torsion spring apart at positions (1).

Remove torsion spring towards top.

Fig 7: Pressing Torsion Spring Apart Positions
G04751234Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Uniform distribution must not  be changed.
Place all components in clean and neat order  in special tool 11 4 481. 

All components must be reinstalled in the same positions in an engine which has already been in use.

Fig 8: Identifying Components With Special Tool (11 4 481)
G04751235Courtesy of BMW OF NORTH AMERICA, INC.
  1. Eccentric shaft with bearing
  2. Bearing caps of eccentric shaft (set out in order)
  3. Inlet camshaft
  4. Bearing caps of inlet camshaft (set out in order)
  5. Intake valves with valve springs
  6. Valve plates and valve cotters
  7. Cam followers with HVCA elements (set out in order)
  8. Torsion springs
  9. Guide blocks (set out in order)
  10. Intermediate levers (set out in order)

Release screws (1) on guide block (2).

Tightening torque. See 11 37 1AZ in 11 37 VARIABLE VALVE GEAR .

Place all guide blocks (2) in neat order in special tool 11 4 481. 

Installation: 

Mixing up the guide blocks (2) will cause the engine to suffer idle-speed fluctuations.

This will result in maladjustment of uniform distribution.

Fig 9: Identifying Screws And Guide Block
G04751236Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

All contact surfaces (1) of guide block must be clean and free from oil and grease. If necessary, clean contact surfaces (1).

Fig 10: Identifying Contact Surfaces
G04751237Courtesy of BMW OF NORTH AMERICA, INC.

Lift out intermediate levers (2).

Place all intermediate levers (2) in neat order in special tool 11 4 481. 

Installation: 

Mixing up the intermediate levers (2) will cause the engine to suffer idle-speed fluctuations.

Installation: 

All contact surfaces (1) must be clean and free from oil and grease. If necessary, clean contact surfaces (1).

Fig 11: Identifying Contact Surfaces And Intermediate Levers
G04751238Courtesy of BMW OF NORTH AMERICA, INC.

All intermediate levers (1) are classified.

All intermediate levers (1) must be reinstalled in the same positions in an engine which has already been in use.

Fig 12: Identifying Intermediate Levers
G04751239Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Before installing intermediate levers (2), make sure cam followers are correctly positioned.
Risk of damage! 

Install intermediate levers (2).

Fig 13: Identifying Contact Surfaces And Intermediate Levers
G04751238Courtesy of BMW OF NORTH AMERICA, INC.

Fit guide block (2) cleanly into opening.

Tighten screws (1) hand-tight.

Check that intermediate levers are in correct installation position.

Release  screws (1) by a 1/4 turn.

Fig 14: Identifying Screws And Guide Block
G04751236Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 4 450  to bolt connection (1) of eccentric shaft.

Turn eccentric lever (3) on special tool 11 4 450  in direction of arrow.

Guide block is now pretensioned.

Insert screws (2) of guide blocks.

Tightening torque. See in 11 37 1AZ 11 37 VARIABLE VALVE GEAR .

Fig 15: Turning Eccentric Lever
G04751242Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

At cylinder no. 3, the guide block can be pre-installed with one screw (internal) only.

Oil spray nozzle is fitted only after torsion spring has been installed.

Install torsion spring (2) on guide block.

Installation: 

Insert torsion spring (2) in intermediate lever (1) (see arrow).

Check that cam follower (3) is in correct installation position.

Fig 16: Inserting Torsion Spring In Intermediate Lever
G04751243Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 4 270  with gripping pliers (3) to guide block (2).

IMPORTANT: Special tool 11 4 270  is only secured to guide block (2).
Adjusting the gripping pliers (3) on special tool 11 4 270  is not permitted. Risk of damage! 
Fig 17: Identifying Gripping Pliers And Guide Block With Special Tool (11 4 270)
G04751230Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Risk of injury in event of incorrect use.
IMPORTANT: Improper handling. Risk of damage! 

Secure both bearing pins (2) in torsion springs with knurled screw (1) of special tool 11 4 270. 

IMPORTANT: Check torsion spring on intermediate lever to ensure correct installation position.

Press special tool 11 4 270  in direction of arrow as far as it will go.

Fig 18: Identifying Bearing Pins And Knurled Screw With Special Tool (11 4 270)
G04751231Courtesy of BMW OF NORTH AMERICA, INC.

Insert screw (2) of torsion spring.

Tightening torque. See 11 37 2AZ in 11 37 VARIABLE VALVE GEAR .

To avoid jamming of screw (2) with torsion spring, it is necessary when inserting screw (2) to increase pretension on special tool 11 4 270  uniformly.

IMPORTANT: Thread on cylinder head. Risk of damage! 

Remove special tool 11 4 270. 

Fig 19: Identifying Torsion Spring Screw With Special Tool (11 4 270)
G04751232Courtesy of BMW OF NORTH AMERICA, INC.

At cylinder no. 3, adjust oil spray nozzle (2) so that oil spray points precisely towards spline teeth (3).

Insert screw (1) with oil spray nozzle (2) (external).

Tightening torque. See 11 37 4AZ in 11 37 VARIABLE VALVE GEAR .

Fig 20: Identifying Oil Spray Nozzle, Spline Teeth And Screw
G04751247Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

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